SE439114B - PROCEDURE FOR THE TREATMENT OF FLUID WATER AND SUSPENSIONS - Google Patents
PROCEDURE FOR THE TREATMENT OF FLUID WATER AND SUSPENSIONSInfo
- Publication number
- SE439114B SE439114B SE7808822A SE7808822A SE439114B SE 439114 B SE439114 B SE 439114B SE 7808822 A SE7808822 A SE 7808822A SE 7808822 A SE7808822 A SE 7808822A SE 439114 B SE439114 B SE 439114B
- Authority
- SE
- Sweden
- Prior art keywords
- suspension
- water
- layer
- compost
- turbid water
- Prior art date
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims description 20
- 238000000034 method Methods 0.000 title claims description 18
- 239000000725 suspension Substances 0.000 title claims description 14
- 239000012530 fluid Substances 0.000 title 1
- 239000002361 compost Substances 0.000 claims description 20
- 239000010802 sludge Substances 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 14
- 239000000835 fiber Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 2
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- 239000000243 solution Substances 0.000 description 9
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 230000029087 digestion Effects 0.000 description 4
- 239000012065 filter cake Substances 0.000 description 4
- 229920000669 heparin Polymers 0.000 description 4
- 244000005700 microbiome Species 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000012267 brine Substances 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 239000000706 filtrate Substances 0.000 description 3
- 238000001914 filtration Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005352 clarification Methods 0.000 description 2
- 238000010828 elution Methods 0.000 description 2
- 238000012432 intermediate storage Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 235000019645 odor Nutrition 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 241000186361 Actinobacteria <class> Species 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- HTTJABKRGRZYRN-UHFFFAOYSA-N Heparin Chemical compound OC1C(NC(=O)C)C(O)OC(COS(O)(=O)=O)C1OC1C(OS(O)(=O)=O)C(O)C(OC2C(C(OS(O)(=O)=O)C(OC3C(C(O)C(O)C(O3)C(O)=O)OS(O)(=O)=O)C(CO)O2)NS(O)(=O)=O)C(C(O)=O)O1 HTTJABKRGRZYRN-UHFFFAOYSA-N 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical group Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- 241001465754 Metazoa Species 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000005119 centrifugation Methods 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000010908 decantation Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000008394 flocculating agent Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229960002897 heparin Drugs 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- GBMDVOWEEQVZKZ-UHFFFAOYSA-N methanol;hydrate Chemical compound O.OC GBMDVOWEEQVZKZ-UHFFFAOYSA-N 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000037074 physically active Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
- B01J20/24—Naturally occurring macromolecular compounds, e.g. humic acids or their derivatives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
- B01D37/02—Precoating the filter medium; Addition of filter aids to the liquid being filtered
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Analytical Chemistry (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Fertilizers (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
- Processing Of Solid Wastes (AREA)
Description
flfx 35 7808822-6 Uppfinningen syftar till att åstadkomma ett nytt för- farande av det inledningsvis angivna slaget, varvid som filterhjälpnedel för avvattningen, speciellt av slam, användes en produkt, som i huvudsak består av biologiskt-fysikaliskt verksamma ämnen, genom vilka åtminstone partikelstorleken och -tätheten för de i suspensionen lösta partiklarna ökas varaktigt för den efterföljande filtreringen, medan däremot suspensionens viskositet sänks . The invention aims to provide a new process of the kind initially indicated, wherein as a filter aid for the dewatering, especially of sludge, a product is used, which mainly consists of biologically-physically active substances, through which at least the particle size and the density of the particles dissolved in the suspension is permanently increased for the subsequent filtration, while on the other hand the viscosity of the suspension is lowered.
Problemet enligt uppfinningen löses genom ett förfaran- de för behandling av grumliga vatten och suspensioner, i synnerhet kommunal-, industri- och liknande slam för efter- följande avvattning, som kännetecknas av att det grumliga vattnet respektive suspensionen bringas i beröring med ett filterhjälpmedel bestående av fiberpartiklar av långt ned- bruten,fortfarande dock biologiskt aktiv kompost med hög vattenupptagningsförmåga och som innehåller 30 - 50 vikts-% vatten, varvid fiberpartiklarna är avsevärt större än par- tiklarna i det grumliga vattnet respektive suspensionen, och varvid den biologiskt aktiva komposten anbringas som ett homogent, luckert skikt med en tjocklek av ca 2 - 10 cm tjock- lek på silbandet i en silbandpress och detta skikt dränks in med det grumliga vattnet respektive den suspension som skall avvattnas genom översprutning med fem till tio gånger det påförda skiktet och därefter tryckavvattnas.The problem according to the invention is solved by a method for treating turbid water and suspensions, in particular municipal, industrial and similar sludges for subsequent dewatering, which is characterized in that the turbid water and the suspension, respectively, are brought into contact with a filter aid consisting of fiber particles of well-decomposed, still biologically active compost with a high water uptake capacity and containing 30 - 50% by weight of water, the fiber particles being considerably larger than the particles in the turbid water and suspension, respectively, and the biologically active compost being applied as a homogeneous, loose layer with a thickness of about 2 - 10 cm thickness on the sieve belt in a sieve belt press and this layer is soaked with the cloudy water and the suspension to be dewatered by spraying with five to ten times the applied layer and then pressure dewatered .
Ytterligare kännetecken för uppfinningen framgår av underkravet. I Användningen av kompost som biologiskt och/eller fysi- kaliskt verkande filterhjälpmedel uppvisar en rad fördelar.Further features of the invention appear from the subclause. The use of compost as a biologically and / or physically active filter aid has a number of advantages.
Genom den på silbandet påförda komposten ökas kornstorleken för slampartiklarna väsentligt vid den doserade tillsatsen av slam, eftersom dessa partiklar vid vätske upptagningen genom komposten samtidigt överföres i dessas kapillärer.Due to the compost applied to the sieve belt, the grain size of the sludge particles is significantly increased during the dosed addition of sludge, since these particles, during liquid uptake by the compost, are simultaneously transferred into their capillaries.
Liksom vid en filtrering på djupet tränger alltså partiklar- na, som är mindre än porstorleken hos kompostpartiklarna, in i de senares kapillärer och avlagrar sig där. Slammets viskositet sänks väsentligt genom den fibrösa strukturen hos komposten. Eftersom dessutom biologiska, exoterma omsätt- níngsprocesser startar genast med införandet av klarslam i 10 20 25 30 7808822-6 3 ett kompostskikt, ökar temperaturen hos slammet, vilket leder till en minskning av slamvattnets ytspänning. Kompost för- blir stabil vid den mekaniska avvattningsprocessen. Den vid kemiska flockningsmedel iakttagna återlösningen av slampar- tiklarna vid den efterflöjande mekaniska avvattningen eller luftningen inträder alltså icke längre. Till och med in- dustrislam, vilka låter sig flockas med svårighet eller inte alls, kan avvattnas på sättet enligt uppfinningen. Genom tillsats av kompost belastas varken rötprocessen för_över- föring av exempelvis klarslam till kompost eller det från slammet avskilda ballastvattnet kemiskt. Dessutom ökas kolandelen i filterkakan, vilket vid en senare biologisk nedbrytning, t ex genom förruttning, har en positiv verkan på kol/kväveförhållandet. som möjliggör rötprocessen sker redan i förfarandesteget Tillsatsen av sådana tillsatser "avvattning". För de efterföljande förfarandestegen vid slamavlägsnandet måste endast filterkaka och kolbärare till- föras rötprocessen, vilket likaså har en fördelaktig inver- kan på den blandningsprocess som alltid föregår en rötpro- cess.As with a deep filtration, the particles, which are smaller than the pore size of the compost particles, penetrate into the capillaries of the latter and deposit there. The viscosity of the sludge is significantly reduced by the fibrous structure of the compost. In addition, since biological, exothermic conversion processes start immediately with the introduction of clear sludge into a compost layer, the temperature of the sludge increases, which leads to a reduction in the surface tension of the sludge water. Compost remains stable during the mechanical dewatering process. The redemption of the sludge particles observed with chemical flocculants during the subsequent mechanical dewatering or aeration thus no longer occurs. Even industrial sludge, which can be flocked with difficulty or not at all, can be dewatered in the manner according to the invention. By adding compost, neither the digestion process is transferred to the chemical transfer of, for example, ready sludge to compost or the ballast water separated from the sludge. In addition, the carbon content of the filter cake is increased, which in a later biological decomposition, for example by decay, has a positive effect on the carbon / nitrogen ratio. which enables the digestion process already takes place in the process step The addition of such additives "drainage". For the subsequent steps of sludge removal, only filter cake and charcoal carriers must be added to the digestion process, which also has a beneficial effect on the mixing process that always precedes a digestion process.
Genom filterhjälpmedlet kompost ympas såväl filterkakan som det bortflytande filtratet med mikroorganismer. De över komposten i filterkakan överförda mikroorganismerna initie- rar en spontan biologisk nedbrytningsprocess, alltså en röt- start. Eftersom tillräcklig mängd luftsyre är närvarande i detta stadium, uppvisar denna nedbrytningsprocess aerob ka- raktär, så att inte några oangenäma lukter är närvarande.Through the filter aid compost, both the filter cake and the effluent filtrate are inoculated with microorganisms. The microorganisms transferred over the compost in the filter cake initiate a spontaneous biological decomposition process, ie a rot start. Since a sufficient amount of atmospheric oxygen is present at this stage, this decomposition process has an aerobic character, so that no unpleasant odors are present.
Den pâförda komposten absorberar alltså i stor utsträckning de från slammen avgående, med oangenäma lukter behäftade gaserna. Detta visar sig speciellt fördelaktigt vid mellan- lagring eller transport av det avvattnade slamgodset. De mikroorganismer som kommer in i filtratet, alltså press- eller ballastvattnet, tillsammans med komposten âterföres i regel till den biologiska klarningsprocessen och tar sig där likaså uttryck som biologisk ympning, vilket påverkar klarningsprocessen gynnsamt. Genom den genom filterhjälp- medlet förbättrade filtreringen sänks även andelen kolloida- la partiklar i filtratet väsentligt. 7900077-4 råheparinet motsvarande ca 425 000 USP-enheter eller 42,5 g, extra- herades tre gånger med vardera 200 ml 2 M koksaltlösning, varvid omröring företogs mellan varje extraktion vid 60°C under 1 timma.The applied compost thus largely absorbs the gases emanating from the sludge, with unpleasant odors. This proves to be particularly advantageous during intermediate storage or transport of the dewatered sludge material. The microorganisms that enter the filtrate, ie the press or ballast water, together with the compost are usually returned to the biological clarification process and find expression there as well as biological grafting, which has a favorable effect on the clarification process. The filtration improved by the filter aid also significantly reduces the proportion of colloidal particles in the filtrate. 7900077-4 The crude heparin, corresponding to about 425,000 USP units or 42.5 g, was extracted three times with 200 ml of 2 M saline solution each, stirring between each extraction at 60 ° C for 1 hour.
De förenade extrakten späddes med vatten tills lösningen innehöll ca 0,9 mol/liter kloridjoner. Man tillsatte 200 ml av en anjonbyta- re ("LewatitkB)CA 9249", Bayer AG, Västtyskland) i kloridform och företog omröring i 1 timma. Man sög därefter av och tvättade med ca 200 ml 0,9 M koksaltlösning. Jonbytaren omrördes därefter under 5 timmar med 2 M koksaltlösning vid 40°C och sögs därefter av och tvättades med 2 M koksaltlösning. Elueringslösningen förenades med tvättlösningen och fälldes med 1,5 gånger så stor volym metanol.The combined extracts were diluted with water until the solution contained about 0.9 mol / liter of chloride ions. 200 ml of an anion exchanger ("LewatitkB) CA 9249", Bayer AG, West Germany) were added in chloride form and stirred for 1 hour. It was then filtered off with suction and washed with about 200 ml of 0.9 M saline solution. The ion exchanger was then stirred for 5 hours with 2 M brine at 40 ° C and then filtered off with suction and washed with 2 M brine. The elution solution was combined with the washing solution and precipitated with 1.5 times the volume of methanol.
Fällningen avskildes genom centrifugering och tvättades först med ca 50 ml vatten-metanol (volymförhållande 1:1,5) och sedan med ca 50 ml metanol och torkades. Man eflfiflJ.198 g Na-heparinat med 195 USP-enheter/mg. 15,5 g av ett på ovan beskrivet sätt erhållet natriumheparinat med ca 200 USP-enheter/mg löstes i 200 ml 2 M koksaltlösning.The precipitate was separated by centrifugation and washed first with about 50 ml of water-methanol (1: 1.5 by volume) and then with about 50 ml of methanol and dried. It contains .1 J.198 g Na-heparinate with 195 USP units / mg. 15.5 g of a sodium heparinate obtained in the manner described above with about 200 USP units / mg were dissolved in 200 ml of 2 M saline solution.
Lösningen sögs av med hjälp av en sugflaska och återstoden tvätta- des först med 30 ml 2 M koksaltlösning och därefter med ca 250 ml helt avmineraliserat vatten. De förenade lösningarna överfördes därefter med helt avmineraliserat vatten till en kloridmolaritet av 0,9. Därefter upprepades på ovan beskrivet sätt reningen med 1 liter "Lewatit RJCA 9249".The solution was sucked off with a suction bottle and the residue was washed first with 30 ml of 2 M saline solution and then with about 250 ml of completely demineralized water. The combined solutions were then transferred with completely demineralized water to a chloride molar of 0.9. Then, in the manner described above, the purification was repeated with 1 liter of "Lewatite RJCA 9249".
Den kombinerade eluerings- och tvättlösningen bearbetades vidare på ovan beskriviet sätt. Efter tvättning och torkning av fällnin- gen erhöll man 11,2 g natriumheparinat, som uppvisade en aktivitet av 251 USP-enheter/mg.The combined elution and washing solution was further processed as described above. After washing and drying the precipitate, 11.2 g of sodium heparinate were obtained, which showed an activity of 251 USP units / mg.
Exemgel 2 I enlighet med förfarandet beskrivet i GB-B-754 885 surgjordes 3 liter saltlake under omröring med ättiksyra till pH 3,1-3,2 (ca 50 ml). Efter nâgra timmar företogs dekantering och återstoden cent- rifugerades. Fällningen kastades bort och de förenade lösningarna neutraliserades med natronlut.Example Gel 2 In accordance with the procedure described in GB-B-754 885, 3 liters of brine were acidified with stirring with acetic acid to pH 3.1-3.2 (about 50 ml). After a few hours, decantation was performed and the residue was centrifuged. The precipitate was discarded and the combined solutions were neutralized with sodium hydroxide solution.
Lösningen försattes långsamt under omröring med en lika stor vo- lym metanol. Efter 45 minuter dekanterades vätskan från det utfäll- da koksaltet. Suspensionen fick stå i flera timmar och den överstâ- ende vätskan dekanterades och återstoden centrifugerades. Fällningen Ch 10 15 7808822-6 Om det visar sig nödvändigt genom arten hos det slam, som skall avvattnas, kan på det med suspensionen indränkta skiktet påföras ett ytterligare skikt filterhjälpmedel med en tjocklek av ca 1 till 5 cm på det beskrivna sättet, var- vid som filterhjälpmedel företrädesvis avses kompost, vars fukthalt hålls så låg som möjligt. tjänar exempelvis doseringssnäckor.The solution was slowly added with stirring with an equal volume of methanol. After 45 minutes, the liquid was decanted from the precipitated salt. The suspension was allowed to stand for several hours and the supernatant was decanted and the residue was centrifuged. Precipitation Ch 10 15808022-6 If it proves necessary by the nature of the sludge to be dewatered, an additional layer of filter aid with a thickness of about 1 to 5 cm can be applied to the layer soaked with the suspension in the manner described, by filter aid is preferably meant compost, the moisture content of which is kept as low as possible. serves, for example, dosing augers.
Som doseringsanordningar UTFÖRINGSEXEMPEL Kommunalt klarslam blandat med 10 till 15 % av en natur- lig kolbärare rötas i en sluten luftningsreaktor såsom exempelvis beskrivits i tyska offenliggörandeskriften 2 541070 och underkastas efter sin bortförsel en efterrötning om ca en till två veckor vid temperaturer av ca 30 till 40°C. Den på detta sätt erhållna biologiskt aktiva, alltså rikligt med mikroorganismer, actinomyceter, bakterier, smådjur m.m. för- sedda komposten kan användas genast som filterhjälpmedel utan längre mellanlagring.As dosing devices EMBODIMENT EXAMPLE Municipal ready sludge mixed with 10 to 15% of a natural coal carrier is digested in a closed aeration reactor as described, for example, in German Offenlegungsschrift 2 541070 ° C. The biologically active thus obtained, i.e. abundant with microorganisms, actinomycetes, bacteria, small animals, etc. The compost provided can be used immediately as a filter aid without longer intermediate storage.
Claims (2)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19782831384 DE2831384A1 (en) | 1978-07-17 | 1978-07-17 | FILTER TOOLS FOR TREATMENT OF SUSPENSIONS, ESPECIALLY COMMUNAL, INDUSTRIAL AND OTHER SLUDGE FOR THE FOLLOWING DRAINAGE |
Publications (2)
Publication Number | Publication Date |
---|---|
SE7808822L SE7808822L (en) | 1980-01-18 |
SE439114B true SE439114B (en) | 1985-06-03 |
Family
ID=6044605
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SE7808822A SE439114B (en) | 1978-07-17 | 1978-08-21 | PROCEDURE FOR THE TREATMENT OF FLUID WATER AND SUSPENSIONS |
Country Status (10)
Country | Link |
---|---|
US (1) | US4595506A (en) |
BE (1) | BE877725A (en) |
CA (1) | CA1149297A (en) |
CH (1) | CH643466A5 (en) |
DE (1) | DE2831384A1 (en) |
FR (1) | FR2431319B1 (en) |
GB (1) | GB2035113B (en) |
IT (1) | IT1122122B (en) |
NL (1) | NL7904945A (en) |
SE (1) | SE439114B (en) |
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DE3721981A1 (en) * | 1987-07-03 | 1989-01-12 | Norddeutsche Seekabelwerke Ag | METHOD AND DEVICE FOR ELIMINATING IMPURITIES IN THE GROUND |
US4961862A (en) * | 1988-03-22 | 1990-10-09 | Baker Hughes | Amendment addition system and method for twin belt press filter |
GB2279888A (en) * | 1993-07-16 | 1995-01-18 | Adrian Parnaby | Moving belt press filter |
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US20110094395A1 (en) * | 2009-10-26 | 2011-04-28 | O'reilly Dominick | Method and attachment for dewatering logs |
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WO2014052674A1 (en) | 2012-09-26 | 2014-04-03 | Evoqua Water Technologies Llc | System for measuring the concentration of magnetic ballast in a slurry |
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CH171030A (en) * | 1933-10-25 | 1934-08-15 | Meyer August | Filter with small pieces of filter material. |
US2101042A (en) * | 1935-01-23 | 1937-12-07 | Canadian Locomotive Company Lt | Method of and apparatus for treating materials |
FR1188812A (en) * | 1957-12-19 | 1959-09-25 | Process for the dewatering of settling sludge | |
DE1206861B (en) * | 1960-04-08 | 1965-12-16 | Metallgesellschaft Ag | Device for continuous dosing of flocculants |
NL286031A (en) * | 1961-11-30 | |||
US3325016A (en) * | 1964-08-18 | 1967-06-13 | Babcock & Wilcox Dampfkessel | Filter earths |
US3428551A (en) * | 1964-10-29 | 1969-02-18 | John Ernest Dawe | Process of preparing a filter medium from moss and its use |
DE1277203B (en) * | 1965-05-08 | 1968-09-12 | Klein Kg A | Belt filter for dewatering in particular the thickened suspensions that arise during wastewater treatment |
FR1490052A (en) * | 1966-08-18 | 1967-07-28 | Rose | Sewage sludge treatment process |
DE1536873A1 (en) * | 1966-10-25 | 1970-03-12 | Passavant Werke | Process for dewatering and, if necessary, further treatment of sludge |
DE1960365A1 (en) * | 1969-12-02 | 1971-06-09 | Lange Gunde Johan Kristian | Dewatering (partly) digested sewage sludge |
DE1965734A1 (en) * | 1969-12-31 | 1971-07-08 | Degussa | Peat as filtering aid in clearing sludge - dehydration |
DE2031842A1 (en) * | 1970-06-26 | 1972-01-13 | Farbenfabriken Bayer Ag, 5090 Leverkusen | Continuously filtering solid dispersions - using coarse fraction from dispersion as filtering medium |
US3870632A (en) * | 1970-09-30 | 1975-03-11 | Calgon Corp | Traveling filter for use with filter medium incineration process |
US3771653A (en) * | 1970-11-17 | 1973-11-13 | Int Minerals & Chem Corp | Compost for removing oil films from water |
US3791990A (en) * | 1972-01-03 | 1974-02-12 | Fischer Holdings | Oil absorbent |
SE366220B (en) * | 1972-03-15 | 1974-09-16 | Sala Maskinfab Ab | |
US4249929A (en) * | 1972-10-25 | 1981-02-10 | Franz Kneer | Method of digesting organic wastes |
DE2541070B2 (en) * | 1975-09-15 | 1980-03-06 | Gebrueder Weiss Kg, 6340 Dillenburg | Process for the continuous composting of organic waste and / or sewage sludge and device for carrying out the process |
DE2558256B2 (en) * | 1975-12-23 | 1978-11-02 | Gebrueder Weiss Kg, 6340 Dillenburg | Device for separating gaseous organic contaminants from exhaust gases |
-
1978
- 1978-07-17 DE DE19782831384 patent/DE2831384A1/en active Granted
- 1978-08-21 SE SE7808822A patent/SE439114B/en not_active IP Right Cessation
-
1979
- 1979-06-18 CH CH565479A patent/CH643466A5/en not_active IP Right Cessation
- 1979-06-26 NL NL7904945A patent/NL7904945A/en not_active Application Discontinuation
- 1979-07-11 GB GB7924145A patent/GB2035113B/en not_active Expired
- 1979-07-11 IT IT24261/79A patent/IT1122122B/en active
- 1979-07-16 FR FR7918322A patent/FR2431319B1/en not_active Expired
- 1979-07-16 BE BE0/196319A patent/BE877725A/en not_active IP Right Cessation
- 1979-07-16 CA CA000331885A patent/CA1149297A/en not_active Expired
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1983
- 1983-12-21 US US06/550,484 patent/US4595506A/en not_active Expired - Fee Related
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GB2035113A (en) | 1980-06-18 |
CA1149297A (en) | 1983-07-05 |
DE2831384C2 (en) | 1989-06-29 |
FR2431319B1 (en) | 1985-09-13 |
GB2035113B (en) | 1982-12-15 |
US4595506A (en) | 1986-06-17 |
NL7904945A (en) | 1980-01-21 |
DE2831384A1 (en) | 1980-01-31 |
CH643466A5 (en) | 1984-06-15 |
IT7924261A0 (en) | 1979-07-11 |
SE7808822L (en) | 1980-01-18 |
FR2431319A1 (en) | 1980-02-15 |
BE877725A (en) | 1979-11-16 |
IT1122122B (en) | 1986-04-23 |
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